Effect of annealing temperature on nano-crystalline TiO2 for solar cell applications

被引：26
作者：
Malevu, T. D. [1 ]
Mwankemwa, B. S. [2 ,3 ]
Motloung, S., V [4 ]
Tshabalala, K. G. [5 ]
Ocaya, R. O. [5 ]
机构：
[1] Univ KwaZulu Natal, Sch Chem & Phys, Westville Campus,Private Bag X54001, ZA-4000 Durban, South Africa
[2] Univ Pretoria, Dept Phys, P Bag X20, Hatfield, South Africa
[3] Univ Dodoma, Coll Nat & Math Sci, Sch Phys Sci, Dept Phys, POB 338, Dodoma, Tanzania
[4] NMMU, Dept Phys, POB 77000, ZA-6031 Port Elizabeth, South Africa
[5] Univ Free State, Dept Phys, P Bag X13, ZA-9866 Phuthaditjhaba, South Africa
来源：
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES | 2019年 / 106卷
基金：
新加坡国家研究基金会;
关键词：
Anatase TiO2 nanocrystals; Annealing temperature; Phase transformation; Hydrothermal crystal growth; EXPOSED; 001; FACETS; ANATASE; NANOSHEETS;
D O I：
10.1016/j.physe.2018.10.028
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
This study investigates the effect of annealing temperature (AT) on structure, morphology and optical properties of hydrothermally synthesized TiO2 nanocrystals. Selected-Area Diffraction (SAED) confirmed high quality monocrystals. XRD and Raman spectroscopy indicate only anatase and rutile phases. At high temperature, the (101) and (001) are preferred. PL emission peaks appear at 407, 416 and 493 nm, which can be attributed to photo-excited electron-hole pairs, band-edge excitons and oxygen vacancy defects, respectively. UV-Vis spectroscopy indicates that AT over the 200-600 degrees C temperature range causes the band gap to decrease from 3.08 eV to 2.73 eV. Hydrothermal synthesis followed by annealing at 600 degrees C is found to be a good route for high-purity, nanocrystalline anatase-phase TiO2 with the preferred {001} orientation that is thought to enhance solar cell performance.
引用
收藏
页码：127 / 132
页数：6
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